Disclosed is a method for performing positioning by a user equipment (UE) in a wireless communication system including: receiving first assistance data including first reference cell information and first neighbor cell information from a first base station (BS) through a first frequency; receiving second assistance data including second reference cell information and second neighbor cell information from a second base station through a second frequency; receiving a positioning reference signal (PRS) on the basis of the first assistance data and receiving a discovery reference signal (DRS) on the basis of the second assistance data; performing measurement using the received PRS and the DRS; and reporting a measurement result to a serving BS.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method for performing, by a user equipment (UE), positioning in a wireless communication system, the method comprising: receiving, from a first base station (BS), first assistance data including first reference cell information and first neighbor cell information through a first frequency; receiving, from a second BS, second assistance data including second reference cell information and second neighbor cell information through a second frequency; receiving, from the first BS, a positioning reference signal (PRS) based on the first assistance data; receiving, from the second BS, a discovery reference signal (DRS) based on the second assistance data; performing a coarse positioning measurement using the received PRS; performing a fine positioning measurement using the received DRS; and reporting results of the measurements to a serving BS, wherein the second assistance data further includes indication information indicating whether the DRS is used for positioning or for discovering.
2. The method of claim 1 , wherein the receiving the PRS comprises receiving a PRS from each of a first reference cell and at least one first neighbor cell based on the first assistance data, and wherein the receiving the DRS comprises receiving a DRS from each of a second reference cell and at least one second neighbor cell based on the second assistance data.
3. The method of claim 2 , wherein the performing the measurements comprises: measuring a first reference signal time difference (RSTD) regarding the first reference cell of the at least one first neighbor cell using the received PRS; and measuring a second RSTD regarding the second reference cell of the at least one second neighbor cell using the received DRS.
4. The method of claim 1 , wherein, in the performing the measurements, an average power level regarding the received PRS and the received DRS is measured.
5. The method of claim 1 , wherein the first assistance data further includes PRS information related to a cell transmitting a PRS, and wherein the PRS information includes at least one of a physical cell identity (ID) (PCID) of a cell transmitting the PRS, a scrambling ID, a PRS transmission period, or a PRS transmission resource.
6. The method of claim 1 , wherein the second assistance data further includes positioning DRS information related to a DRS for positioning, and wherein the positioning DRS information includes at least one of DRS measurement timing configuration (DMTC) information, DMTC occasion information, DRS information, identification information of a second reference cell, or identification information of at least one second neighbor cell.
7. The method of claim 6 , wherein the DRS information includes at least one of a physical cell identity (ID) (PCID) of the at least one second neighbor cell, a cell global ID associated with the PCID, DRS channel state information-reference signal (CSI-RS) configuration information, or zero power (ZP)-CSI-RS configuration information.
8. The method of claim 7 , wherein, in the receiving the DRS, the DRS is blind-detected in a DMTC duration or a DMTC occasion duration based on the positioning DRS information.
9. The method of claim 1 , wherein the first BS is a macro BS or a macro cell, and the second BS is a small BS or a small cell.
10. The method of claim 1 , wherein the second frequency is higher than the first frequency.
11. The method of claim 10 , wherein a transmission period of the DRS is shorter than a transmission period of the PRS.
12. A user equipment (UE) for performing positioning in a wireless communication system, the UE comprising: a transceiver configured to transmit and receive a wireless signal; and a processor functionally connected to the transceiver, wherein the processor is configured to: control the transceiver to receive, from a first base station (BS), first assistance data including first reference cell information and first neighbor cell information through a first frequency, control the transceiver to receive, from a second BS, second assistance data including second reference cell information and second neighbor cell information through a second frequency, control the transceiver to receive, from the first BS, a positioning reference signal (PRS) based on the first assistance data, control the transceiver to receive, from the second BS, a discovery reference signal (DRS) based on the second assistance data, perform a coarse positioning measurement using the received PRS, perform a fine positioning measurement using the received DRS, and report results of the measurements to a serving BS, wherein the second assistance data further includes indication information indicating whether the DRS is used for positioning or for discovering.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
September 3, 2015
December 24, 2019
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